This document provides information on drafting symbols used for machining and geometric tolerances. It defines symbols for surface roughness, machining method, sampling length, direction of lay, and machining allowances. It also includes symbols used to represent threads, thread form, and whether a thread is right-handed or left-handed.

1. Drafting Symbol
Tarun B Patel

3. Machining symbol and its interpretation

8. a = Surface roughness value
b = machining method
c = Sampling Length
d = Direction of Lay
e = Machining Allowances

9. Geometrical symbols and its interpretation

16. Thread Representation

17. Thread Form

18. Thread Representation

19. Right & Left hand thread